Stair climbing apparatus for collapsible wheelchair

Details Stair climbing apparatus for collapsible wheelchair Stair climbing apparatus for collapsible wheelchair

1990-12-06

1992-10-27

Marmor, Charles A.

Land vehicles

Step or abutment ascending type vehicle

With endless track

280DIG10, 180 932, 180907, A61G 506

Patent

active

051583097

ABSTRACT:
A stair-climbing attachment for a conventional foldable wheelchair including clutch mechanisms connecting the main wheels of the wheelchair to a drive mechanism for manually driving stair-climbing treads, ratchet and pawl mechanisms to selectively prevent or permit descending movement of the wheelchair on stairs, and manually actuated levers to manually position the treads in an operable and inoperable condition, the attachment permitting the wheelchair to be folded and conveniently transported by the user without outside assistance. A second embodiment incorporates a reversible motor to drive the treads. A third embodiment uses a hydraulic mechanism to position the treads.

REFERENCES:
patent: 2751027 (1956-06-01), McLaughlin
patent: 3064744 (1962-11-01), Jennings
patent: 3191953 (1965-06-01), Aysta
patent: 3529688 (1970-09-01), Bruce
patent: 4566707 (1986-01-01), Nitzberg
patent: 5042607 (1991-08-01), Falkenson et al.

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